Facebook could have artificial intelligence tools within a five- to 10-year period that accurately flag hate speech.

CEO Mark Zuckerberg said in a Senate hearing that he is optimistic that in that time period the company will have the tools that can get into "linguistic nuances" of content to be more accurate in flagging posts that use hate speech.

Today, he said, "we're just not there on that."

Zuckerberg is facing 44 senators as part of a rare joint committee hearing to address how his company handles user privacy and other issues.

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3:30 p.m.

Facebook CEO Mark Zuckerberg says "it was clearly a mistake" to believe the data-mining company Cambridge Analytica deleted Facebook data it had gathered in an attempt to sway elections.

A former employee of Cambridge Analytica, a London-based data-mining firm with ties to U.S. President Donald Trump, said the company collected the Facebook information of tens of millions of users without their permission. The firm got Facebook information through an app in order to build psychological profiles on a large portion of the U.S. electorate.

Zuckerberg said the company considered the data collection "a closed case" because they thought the data had been deleted. He said they would handle it differently today.

He said the company did not alert the Federal Trade Commission about the data collection.

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3:05 p.m.

Facebook CEO Mark Zuckerberg is facing 44 senators as part of a rare joint committee hearing to address how his company handles user privacy and other issues.

Zuckerberg said in his opening statement Tuesday that Facebook didn't do enough to prevent its tools from being used for harm. This, he says, goes for fake news, foreign elections interference, hate speech and data privacy.

Zuckerberg is apologizing, as he has in the past, and says he is "responsible" for what happens on Facebook. Zuckerberg is also reiterating that the company is in the process of investigating apps that had access to user data. He says the company is investigating "many apps," in the tens of thousands.

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2:40 p.m.

A person wearing a blue and green pointy wig, aiming to look like a Russian troll, watched from the back of the room as the Senate kicked off its hearing with Facebook CEO Mark Zuckerberg. The person wore a red and blue Russian flag around his neck.

Other protesters held up signs that said "Stop Corporate Spying."

Judiciary Committee Chairman Chuck Grassley noted that the crowd was not big by the standards of the gargantuan social network platform. But the hearing room was filled, with a line of hundreds of people waited down the hall and into the next office building.

Zuckerberg is testifying in the Senate on Tuesday and the House on Wednesday.

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2:15 p.m.

The first of two congressional hearings with Facebook CEO Mark Zuckerberg has begun.

Zuckerberg is testifying in the Senate on Tuesday and the House on Wednesday. He agreed to testify after revelations that Cambridge Analytica, a data-mining firm affiliated with Donald Trump's presidential campaign, gathered personal information from 87 million users to try to influence elections.

Senators are expected to also ask him about Russian interference on his company's platform in the 2016 election.

In testimony released Monday, Zuckerberg apologizes for the privacy scandal and for not recognizing Russian interference sooner.

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2 p.m.

Twitter says it is endorsing the Honest Ads Act, a bipartisan bill designed to make online political advertisements more transparent by revealing who paid for them, among other information.

Facebook recently came out in support of the bill. The company's CEO, Mark Zuckerberg, is testifying before Congress on Tuesday and Wednesday on users' data privacy and other issues, including foreign elections interference.

Google, Facebook and Twitter were questioned last fall about Russian elections meddling through their platforms and all three were asked whether they'd support the bill. Google did not immediately respond to a request for comment on Tuesday afternoon.

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12:30 p.m.

Facebook faces two new federal lawsuits for allegedly violating the trust of the millions of users whose personal data was shared with the data-mining firm Cambridge Analytica.

A California suit filed Monday seeks a court order to halt what it calls Facebook's unfair and deceptive business practices.

A Delaware case filed Tuesday contends Facebook violated a 2011 consent decree with the Federal Trade Commission. It also names Cambridge Analytica and its business partners as defendants, alleging they committed fraud by using the social network to obtain personal data on at least 80 million Facebook users without their knowledge and consent.

Both are seeking class-action status. Lawyers in the Delaware case say they are aware of about a dozen similar suits. Facebook had no comment, but referred to previous statements that called Cambridge Analytica's actions a breach of trust.

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10 a.m.

Facebook has begun alerting some users that their data was swept up in the Cambridge Analytica privacy scandal.

A notification that appeared on Facebook for some users Tuesday told them that "one of your friends" used Facebook to log into a now-banned personality quiz app called "This Is Your Digital Life." The notice says the app misused the information, including public profile, page likes, birthday and current city, by sharing it with the data-mining firm Cambridge Analytica.

As many as 87 million users who might have had their data shared were supposed to get a detailed message on their news feeds starting Monday. Facebook says more than 70 million of the affected users are in the U.S., though there are over a million each in the Philippines, Indonesia and the U.K.

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1:45 a.m.

Experts are questioning whether Facebook is fundamentally changing its relationship with users or just tinkering around the edges of its deep need for user data to sell ads.

CEO Mark Zuckerberg is testifying before Congress on Tuesday and Wednesday in the wake of revelations that pro-Donald Trump data-mining firm Cambridge Analytica scooped millions of Facebook users' data without their knowledge.

Researchers say it's unlikely that Facebook will upset its business model, which allows advertisers to precisely target users, even as the company clamps down on the information it passes to app developers.

And Wall Street analysts are counting on Facebook to survive a user revolt, with shares up some 4 percent after a nine-month low hit late last month.

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12:10 a.m.

After privately assuring senators that his company will do better, Facebook CEO Mark Zuckerberg is undergoing a two-day congressional inquisition that will be very public — and could be pivotal for his massive company.

Zuckerberg visited with senators in closed-door meetings Monday, previewing the public apology he plans to give Congress on Tuesday after revelations that the data-mining firm Cambridge Analytica gathered personal information from 87 million users to try to influence elections.

Zuckerberg will testify before a joint session of two Senate committees on Tuesday and before a House panel on Wednesday.

In prepared testimony released Monday by the House Energy and Commerce Committee, Zuckerberg apologizes for fake news, hate speech, a lack of data privacy and Russian social media interference in the 2016 elections.